| Improper use of pesticides will cause that pesticide residues in crops is too excessive, Therefore, in order to reduce pesticide hazard thought degradation of pesticide residues in crops, Study of pesticide safety has become the focus of attention at china and abroad.This topic's research for one kind of pesticide security agent (composite exogenous substances) degradation effects, the application method and to the crops physiology mechanism and the quality influence have been conducted.1. Besides the crops cotton, the composite exogenous substances has better agrochemical alleviates effect to the vegetables. For dichlorvos and rigor, composite exogenous substances have a more significant degradation effects to the dichlorvos. After spurting the different density of composite exogenous substance, its pesticide residues reduce in the varying degree comparing with pesticide blank , to spurt 800 time of composite exogenous substances is the best effection to the pesticide residues degeneration , next is to spurt 600 time and 1,000 times; 2d after spraying exogenous substances to reduce pesticide residues in the lowest, the increase times of using exogenous substances could improve the degeneration effection for pesticide residues , but while reaching the certain number of times, its degeneration effect will tend to the balance. we recommended the application method: spray 800 time of exogenous substances after two days to spray pesticides, 1 time.2. This study shows that: The SOD, CAT, POD performance of amaranth rise after a downward trend. After spurting extraneous substances, compared with the pesticide blank, SOD, POD and CAT content of amaranth was higher than pesticide comparison for the first 3 days, and then declined. To spray exogenous substances can induce antioxidant enzymes activity, increase the activity of crop antioxidant enzymes, reduce the pesticides damage on the crop .3. To spray exogenous substances can improve the content of chlorophyll and photosynthesis of crop, increase crop production. Compared with the pesticide comparison, after using pesticide, spraying exogenous substances generally reduced the soluble protein content, the decline of soluble sugar and vitamin C's content. Improve the quality of the amaranth. Compared with the pesticide blank, spraying exogenous substances, lowed amaranth's soluble protein content, increased amaranth 's soluble sugar and vitamin C content, improve the quality of the amaranth. |
